Thermodynamics and Kinetic Studies of Iron(III) Adsorption by Olive Cake in a Batch System
Zaid Ahmed Al–Anber,1* and Mohammed A. S. Al–Anber2
1 Department of Chemical Engineering, Faculty of Engineering Technology, Al–Balqa University, Amman, P.O. Box 15008 Amman 11131, Jordan. Phone: 00962 777 24 39 14.*Responsible author: z_alanber@yahoo.com.
2 Industrial Inorganic Chemistry, Department of Chemical Science, Faculty of Science Mu'tah University, P.O. Box 7, 61710 Al–Karak, Jordan
Recibido el 26 de noviembre de 2007
Aceptado el 4 de abril de 2008
Abstract
The adsorption of Fe(III) ions from the aqueous solution model using olive cake as an adsorbent has been investigated. The influences of the initial pH, temperature, contact time and dosage of the adsorbent on adsorption performance have been experimentally verified by a batch method. The adsorbent used in this study exhibited a good adsorption potential at initial pH 4.5 for temperatures 28, 35 and 45 °C. The removal efficiency and distribution coefficient have also been determined for the adsorption system as a function of dosage of the adsorbent. The experimental results are described by Langmuir, Freundlich and Dubinin–Kaganer–Radushkevich (DKR) isotherm models. Experimental results show that the kinetic model of pseudo–second order provided a good description of the whole experimental data more than the kinetic of the Lagergren–first order.
Key words: Adsorption, iron ions, olive cake, isothermal and kinetics models.
Resumen
Se investigó la adsorción de iones Fe(III) de la solución acuosa modelo utilizando el bagazo de oliva como adsorbente. La influencia del primer pH, temperatura, tiempo de contacto y la dosis de adsorbente en el rendimiento de la adsorción se verificó experimentalmente por el método de lote. El adsorbente utilizado en este estudio exhibió un buen potencial de adsorción inicial a pH 4.5 para temperaturas de 28, 35 y 45 °C. La eficiencia de eliminación y el coeficiente de distribución se determinaron también para el sistema de adsorción en función de la dosis de adsorbente. Los resultados se describen en modelos de isotermas de Langmuir, Freundlich y Dubinin–Kaganer–Radushkevich (DKR), los cuales muestran que el modelo de cinética de pseudo segundo orden describe adecuadamente la totalidad de los datos experimentales, aún más que la cinética de Lagergren de primer orden.
Palabras clave: Adsorción, iones Fe, bagazo de oliva, modelos de isotermas y de cinética.
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]]>Acknowledgments
Thanks go to the Directorate of Laboratories in Jordanian Army Forces for analyzing the samples.
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